2 Port SuperSpeed USB 3.0 (macOS Native) ExpressCard|34 Adapter – local338
Expresscard/34 port not working after macOS High Sierra update | MacRumors Forums
Amazon.com: StarTech.com 1 Port Flush Mount ExpressCard SuperSpeed USB 3.0 Card Adapter with UASP Support - ExpressCard USB 3.0 Adapter (ECUSB3S11), Green : Everything Else
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2 Port USB 3.0 ExpressCard 34 Adapter MacBook Pro 15"/17" *OS X Native Supported | eBay
2 Port SuperSpeed USB 3.0 (macOS Native) ExpressCard|34 Adapter – local338
Buy: MacBook Pro (2006-2011) ExpressCard 34 USB 3.0